As revealed on Capcom-Unity, Capcom follower Aaron Sedillo won the competition to design a Challenge Room. You can admire his sketch of the layout over there.

It looks painful - a difficult spike-sided descent and ascent sequence followed by steps, a back-and-forth swing sequence over a chasm and then a very delicate, lengthy drop ending in a right-angle swing through the end gate, which looks like it requires very precise timing.

To access the level, just enter the following cheats on the title screen: